XRT75R12D_06 Datasheet, PDF (53/134 Pages) Exar Corporation – TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET

XRT75R12D
REV. 1.0.1 TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
TABLE 15: ASYNCHRONOUS TIMING SPECIFICATIONS
SYMBOL
PARAMETER
MIN
t₀
Valid Address to CS Falling Edge
0
t₁
CS Falling Edge to RD Assert
0
t₂
RD Assert to RDY Assert
-
NA
RD Pulse Width (t₂)
70
t₃
CS Falling Edge to WR Assert
0
t₄
WR Assert to RDY Assert
-
NA
WR Pulse Width (t₄)
70
MAX
-
-
65
-
-
65
-
UNITS
ns
ns
ns
ns
ns
ns
ns
FIGURE 36. SYNCHRONOUS µP INTERFACE SIGNALS DURING PROGRAMMED I/O READ AND WRITE OPERATIONS
PCLK
Addr[7:0]
CS
D[7:0]
RD
WR
RDY
READ OPERATION
t₀
Valid Address
WRITE OPERATION
t₀
Valid Address
Valid Data for Readback
t₁
t₂
Data Available to Write Into the LIU
t₃
t₄
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